Whenever you walk through your garden in july august and september the large blooms of agapanthus 39glenavon39 are sure to stop you in your tracks its flowerheads are made up of many blue florets while each petal is adorned with an eye45catching purple stripe this african blue lily is appreciated for its foliage as well as its flowers its green leaves can provide unbeatable ground cover all year round if given adequate protection indeed the hardy perennial is tougher than most